also: はっぴねす
noun
A direct loanword from English, used in Japanese with the same meaning. Often appears in product names, song titles, or as a stylish alternative to native words like 幸福 (こうふく) or 幸せ (しあわせ).
この曲のタイトルは「ハピネス」です。
The title of this song is 'Happiness'.
彼女は日々の小さなハピネスを大切にしている。
She cherishes the small happinesses of everyday life.
Borrowed from English 'happiness'. The spelling ハピネス is a common Japanese adaptation, while ハッピネス reflects a more phonetically precise rendering.